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# Test whether the compiler supports explicit template instantiation.
# This actually creates a class template instantiation in one source
# file and tries to use it from another. This approach checks that
# both the instantiation syntax and symbol linkage is handled
# properly.
IF("VTK_EXPLICIT_TEMPLATES" MATCHES "^VTK_EXPLICIT_TEMPLATES")
MESSAGE(STATUS "Checking support for C++ explicit template instantiation")
MAKE_DIRECTORY(${VTK_BINARY_DIR}/CMakeTmp/TestExplicitInstantiation)
STRING(ASCII 35 POUND)
WRITE_FILE(
${VTK_BINARY_DIR}/CMakeTmp/TestExplicitInstantiation/CMakeLists.txt
"PROJECT(EXPLICIT)\n"
"ADD_LIBRARY(A A.cxx)\n"
"ADD_EXECUTABLE(B B.cxx)\n"
"TARGET_LINK_LIBRARIES(B A)\n"
)
WRITE_FILE(
${VTK_BINARY_DIR}/CMakeTmp/TestExplicitInstantiation/A.h
"${POUND}ifndef A_h\n"
"${POUND}define A_h\n"
"template <class T> class A { public: static T Method(); };\n"
"${POUND}endif\n"
)
WRITE_FILE(
${VTK_BINARY_DIR}/CMakeTmp/TestExplicitInstantiation/A.cxx
"${POUND}include \"A.h\"\n"
"template <class T> T A<T>::Method() { return 0; }\n"
"template class A<int>;"
)
WRITE_FILE(
${VTK_BINARY_DIR}/CMakeTmp/TestExplicitInstantiation/B.cxx
"${POUND}include \"A.h\"\n"
"int main() { return A<int>::Method(); }\n"
)
TRY_COMPILE(VTK_EXPLICIT_TEMPLATES
${VTK_BINARY_DIR}/CMakeTmp/TestExplicitInstantiation/Build
${VTK_BINARY_DIR}/CMakeTmp/TestExplicitInstantiation
EXPLICIT OUTPUT_VARIABLE OUTPUT
)
IF(VTK_EXPLICIT_TEMPLATES)
MESSAGE(STATUS "Checking support for C++ explicit template instantiation -- yes")
SET(VTK_EXPLICIT_TEMPLATES 1 CACHE INTERNAL "Support for C++ explict templates")
WRITE_FILE(${CMAKE_BINARY_DIR}/CMakeFiles/CMakeOutput.log
"Determining if the C++ compiler supports explict template instantiation "
"passed with the following output:\n"
"${OUTPUT}\n" APPEND)
ELSE(VTK_EXPLICIT_TEMPLATES)
MESSAGE(STATUS "Checking support for C++ explicit template instantiation -- no")
SET(VTK_EXPLICIT_TEMPLATES 0 CACHE INTERNAL "Support for C++ explict templates")
WRITE_FILE(${CMAKE_BINARY_DIR}/CMakeFiles/CMakeError.log
"Determining if the C++ compiler supports explict template instantiation "
"failed with the following output:\n"
"${OUTPUT}\n" APPEND)
ENDIF(VTK_EXPLICIT_TEMPLATES)
ENDIF("VTK_EXPLICIT_TEMPLATES" MATCHES "^VTK_EXPLICIT_TEMPLATES")
|
